Added Spanish book data
Today, I added support for "Amazon.es", which is a large database of Spanish language books.
When you browse for books, you can choose "amazon.es" in your search, and (mostly) only spanish language books should be found (ie, only books old at Amazon's store for Spain).
This improvement will make it much easier for those of you entering Spanish language books to give away, because all you'll need to do is find the book with a search, rather than having to enter in all the book details.
I also added a "Preferred Amazon store" choice on the bottom of your profile page, so that links to more information (ie the "Amazon" buttons on the book pages) go to the appropriate store for your country.
Where (for instance) a Spanish language book might have been added in the USA, you might be in Spain and prefer to read the user's comments on Amazon.es